What could be worse than being sent to jail for the rest of your life? How about being pulled from prison by a time travelling tyrant named Tippy Tinkletrousers!
Now our heroes, George and Harold, are going back in time to when the scariest thing they had to face was a bully named Kipper Krupp. And because George and Harold haven't invented Captain Underpants yet, they are on their own.
Will their brains be enough to beat the bully?